I have been reloading 6.5 carcano rounds and i had a box of ppu 6.5 carcano 139gr FMJ. The factory rounds werent having any issues but some of my reloads were having the primers back out and had one that got punctured. Is this because my loads are too light or too hot? My loads were all in published data no where near maximum loads.

Its just puzzling me since its only on my loads and not the factory rounds